#include<stdio.h>
int main()
{
    long  i; /*吴石磊*/
    int j;
    printf("Please input number;");
    scanf("%ld",&i);
    for(j=999;j>100;j--)
    if(i%j==0)
    {
        printf("The max factor with 3 digits in %ld is:%d,\n",i,j);
        break;

    }
}